Direct interaction between the Rice yellow mottle virus (RYMV) VPg and the central domain of the rice eIF(iso)4G1 factor correlates with rice susceptibility and RYMV virulence

Molecular Plant-microbe Interactions : MPMI
Eugenie HebrardFlorence Vignols

Abstract

The adaptation of Rice yellow mottle virus (RYMV) to recessive resistance mediated by the rymv1-2 allele has been reported as a model to study the emergence and evolution of virulent variants. The resistance and virulence factors have been identified as eukaryotic translation initiation factor eIF(iso)4G1 and viral genome-linked protein (VPg), respectively, but the molecular mechanisms involved in their interaction are still unknown. In this study, we demonstrated a direct interaction between RYMV VPg and the central domain of rice eIF(iso)4G1 both in vitro, using recombinant proteins, and in vivo, using a yeast two-hybrid assay. Insertion of the E309K mutation in eIF(iso)4G1, conferring resistance in planta, strongly diminished the interaction with avirulent VPg. The efficiency of the major virulence mutations at restoring the interaction with the resistance protein was assessed. Our results explain the prevalence of virulence mutations fixed during experimental evolution studies and are consistent with the respective viral RNA accumulation levels of avirulent and virulent isolates. Our results also explain the origin of the residual multiplication of wild-type isolates in rymv1-2-resistant plants and the role of genetic conte...Continue Reading

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Citations

Sep 28, 2012·Molecular Plant-microbe Interactions : MPMI·C ReinboldV Brault
May 21, 2013·Annual Review of Microbiology·Anne E Simon, W Allen Miller
Feb 1, 2012·PLoS Pathogens·Nils PoulicardDenis Fargette
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Oct 10, 2021·Molecular Plant-microbe Interactions : MPMI

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